Reamer.



A. E. HA'IRKNIESSLF REA'MEB. APPLICATION 1.11.51) on. 61 1911'.

' Patehted Ju1y'13, 191 5.

'1 2 SHEETS-SHEET1 A. E. HARKNESS.

REAMER.

APPLICATION FILED OCT- 6. 1911.

1,146,250, Patented July 13, 1915.

"Uwirnn snares PATENT orrion."

ALBERT E. HABKNESS, F BRADFORD, PENNSYLVANIA,

REAMER.

Specification of Letters Patent. Patented July 113, 1%15,

Application filed October 6, 1911. Serial n6. 653,218.

To all whom it may concern:

' Be it known that I, ALBERT E.'HARKNESS, citizen of the United States, residin at Bradford, in-the county of McKeanand State of Pennsylvania, have invented certain new and useful Improvements in Reamers, of which the'following is a specification.

The invention relates to improvements in reamers, more particularly to what are known as under reamers which are employed for enlarging the bore of Artesian or like drilled wells'where a casing is used and the toolintroduced and withdrawn through the casing, and employed to enlarge the drill hole in advance of the casing,

and has for one of its objects to improve the construction and increase the efficiency and utility of devices of this character.

With this and other objects in View, the invention consists in certain novel features of construction as hereinafter shown and.

described, and then specifically pointed out in the claims, and in the drawings .illustrative of the preferred embodiment of the invention: Figure 1 is a side elevation of the improved device partly in section; Fig. 2 is a front elevation ofthe improved device partly in section; Figs. 3 and 4c are perspectivewiews of the reamer bits detached;v Fig. 5 is a longitudinal section on the line 55 of .Fig. 2 with the bits in operative position;

Fig. 6 is a perspective view of the stock or. body portion of the improved device; Fig.

7 is a view similar to Fig. 1 with the bits in withdrawn position to permit the device to be inserted into the well hole through the casing; Fig. 8 is a plan view of the set ring,

' detached.

Corresponding and like parts are referred to in the-following description and 1ndi- .cated in all the views of the accompanying drawings by the same reference characters. The stock or body is represented as a whole at 10, and is formed with the usual tapered threaded stud at the upper end to receive the jar device or operating rope,

and with a transverse opening 11 near its.

lower end and reduced between the bottom of the opening and the bottom of the stock as represented at 12, and with inclined portions 13 at the juncture of the reduced portion 12 and the bottomof the stock at the sides of the opening. At its upper end the stock 10 is longitudinally bored as represented at 14 and the borereduced'at its inner end as shown at 15, and communicating by the reduced portion with the interior of the opening 11. The reamer bits are represented respectively at 16 and each includes an upper reduced portion 17 to closely engage in the opening 11 and with inwardly di-' rected upper ends 18, the inwardly directed ends having half sockets in their confronting faces. The reamer bits are provided with lateral offsets 19 with their up er faces inclined and engaging the incline projections 13 of the stock. The reamer bits are inclined slightly below the shoulders 19 as shown at 20 tocorrespond with the'inclined.

side faces (if the portion 12 of the stock. Below.the inclined faces 20 the reamer bits are diverged as shown, and formed with cutting terminals. The reamer bits thus diverge in opposite directions at their lower portions and closely engage against the reduced projection 12 and beneath the inclined overhangs 13 with the inturned terminals 1.8 engaging by their confronting faces beneath the reduced portions ,15 of the bore and registering therewith. A rod 23 extends through the reduced bore 15 of the. stock its force to maintain the head 24 yielda'bly in-engagement with the overhang portions 18 of the cutting bits and thus holds themyieldably in position.

The bits 16 are provided with projections 21 and inwardlydirected stop shoulders'22, the object to be hereafter explained.

Surrounding the stock 10 opposite --the aperture 11 and the reduced upper portions 17 of the bits, is a band or sleeve 30 secured in place bystop pins 31 or other fastening devices, and serving to retain the bits in position and prevent their displacement in event of the breakage of the operating rod. .The reduced web 12 of the stock is provided .with a longitudinal bore, while the lateral enlargement 24: of the rod 23 isprovided with a threaded socket so that'an operating i rod 32 may be inserted through the bore of tne r ages 1.11% 2 of the cod 23, to enable the rod 29 o-JQ) head to be withdrawn sistance of the spring. 29 to enable the bits to be drawn outwardly and the shoulders 22 engaged with the reduced portion 12 as shown in Fig. 5, to enable the device tobe inserted into the casing represented at 33. A split setting ring 84: is placed tempo rarily around the bits as shown in Fig. 7,

and the rod 32 detached, the ring operating to hold the bits in withdrawn position until the cutting ends of the bits have been in the reaction of the spring 29 will release the shoulders 22 from the projection 12 and restore the bits to their operative and distended position as shown in Fig. 1. Thereafter the device may be employed as a reamer to enlarge the opening beneath the casing by motion imparted to the operatingrod in the ordinary manner. When it is desired to remove the device from the Well, it is only necessary to draw it forcibly upward until the projections'21 again engage against the casing 33 when the latter will operate to lower the bits against the resistance of. the spring 29, and again connect the shoulders 22 with the projection 12, this movement as will be obvious, withdrawing the cutting ends of the bits and disposing them in the position shown in Fig. 7, enabling the device to be withdrawn. .As soon as the bits have been moved to a sufficient extent above the upper end of the casing the split holding ring 34 can be again placed around the bits and thus hold them in closed position. The stock 10 is formed relatively heavy to enable it to withstand the severe strains and shocks to which it will be subjected when in use, while the cutting bits are likewise relatively heavy and solid for the same purpose. The overhang portions 18 of the bits are provided with upwardly directed projections 35 which engage in corresponding re- I face beveled whereby the intermediate s being p eled lateral shoulder, said sl ders adapted to engage against 1 shoulders of the stock, each cutting L having intermediate portions of its i tions of tile blades will engage flatly the active faces of the projection when shoulders of? the blades are in looking gagement with the shoulder of the stock, and yieldable means arranged in the stock for normally holding the blades in operative p0 sition.

2. In a device of the character described, a stock having a transverse opening,

, ting bits having their upper portions engaging in the opening of the stock and removable sleeve incasing the stock for holding the bits against accldental displace 'ment, said sleeve being movable upwardly to release the bits. m.

3. Th a device of the character described a stock having a transverse opening, a pair of co-acting cutting bits having inwardly directed extensions formed on their upper terminals, said extensions being received within the transverse opening of the stoclt, yieldable means normally holding the extensions at the upper terminal of the transverse opening and a sleeve removably mounted on the stock and partially closin the transverse opening thereof, the unclosed portion of the transverse opening being of less width than the said extensions whereby the bits are normally held against accidental Withdrawal from the stock, and yieldable means carried by the stock and engageable with the extensionsof the bits for normally holding the bits in operative position.

4. Tn a device of the character described, a stock, cutting blades removably engaging the stock, co-acting shoulders formed on the ,1

ders of the stock, and a sleeve removably mounted on the stock for normally holding the blades against removal therefrom, said sleeve being movable upwardly to release the blades. 7

5. In a tool of the character specified, a i

stock having a transverse opening near its lower end and a central longitudinally ex tending wedge-shaped projection below the opening with its lower end oppositely inclined and having under cut shoulders at opposite sides of the transverse opening and wedge-shaped projection, cutting blades arranged upon op'posite sides of the wedgeshaped projection and having inwardly directed projections at their upper ends to extend over the said projection and operate in tween the cutting blades and stock normally the transverse opening, and having inexerting an upward pull upon the cutting wardly extending intermediate portions to blades. ride upon the faces of thesaid wedge-pro In testimony whereof I aflix my signature 5 jection, and having intermediated 13136131 in presence of two witnesses.

shoulders which are outwardly an own- Wardly inclined to engage under the under ALBERT HARKNESS' 'cut shoulders of the said wedge projection, Witnesses: means for retaining the cutting blades in R. R. RAUB,

10 place, and yieldable connecting means he E. C..RIMER. 

